Supervision guidelines for Lpn's in a Home Health Setting

[tjbabikian]

Is there anyone out there who can tell me the Medicare guidelines for the supervision of Lpn's in a Home health setting? I am an LPN and I have tried researching this topic in CMS. gov only to find very vague wording under section 484.30(b). I would appreciate any help on this topic. I have heard every 30 days but Iv's also heard every 90 days, help!